jbrunsvig

I have a 98 Expedition and the 4x4 will not engage. When I shift it from 2wd to 4wd the light comes on but dose not engage. When I shit it from 4wd to 4wd low it will shift into low gear but not the front wheels. Any help?

Eddie Bauer

4 words; Vacuum Activated Autolocking Hubs.

It could be something as simple as a vacuum line that's been pulled off. On your model year when they lose vacuum they go into unlock mode, on subsequent years lost of vacuum cause the hubs to lock.

jbrunsvig

Where would I start to look? Any idea?

Bert

Look at the vacuum lines from the engine down. They can get knocked off, so look closely.

Eddie Bauer

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This diagram will explain it better;
http://www.warn.com/powertrain/image...VLH%202006.PDF
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jbrunsvig

Thanks guys, I will let you know what I find

jbrunsvig

I just wanted to add that I have an xlt 4.6 and it also has the awd setting when I looked at the diagram on the fan shroud it didnt have anything on it about the 4x4, when i got under and took a look at it i think i have an electric shift motor could that be it? if it is a vaccum line where would i look?

Bert

I don't think the 98 Expeditions had vacuum shifting. GM vehicles had. It's probably the shift motor, they have had problems with them. Tomorrow I'll have access to info about it and post more.

jbrunsvig

Thanks for the help if you wouldn't mind sending it to my email it is jbrunsvig@gmail.com I have been looking at my haynes manual and it looks like an easy swap just let me know if you think it might be something dif or if there is some way to test the motor once again thank you!

jbrunsvig

Well I checked the transfer case motor and that worked fine. all of the vaccum lines looked to be fine. now what?